<h2 class="pagesubsectionheader">Product Warranties</h2>
<ul>
<?php
    $args = ('post_type=document&meta_key=documenttype&meta_value=Warranty');
    $warranties = new wp_query($args);
        while($warranties->have_posts()) : $warranties->the_post();
?>
    <li><a href="<?php the_permalink(); ?>" target="_blank">Warranty | <?php the_title(); ?></a></li>
<?php
    endwhile;
    wp_reset_query();
?>
</ul>